Improvement in drop-lifters



F, SEWARD.

DROP-LIF'TER. No.177,164. Patented May 9,1876.

N- PEIERS, PNOT0 LITNOGRIAPMER WASHINGTON. D, C.

new.

hence brings a great strain upon the mechanhearing or clutch between thedriving-gear UNITED STATES PATENT OFF E.

FRANK SEWARD, OF NEW HAVEN, CONNECTICUT, ASSIGNOR To MILO PEOK, or SAMEPLACE.

IIV IPROVEMENT IN DROP-LIFTERS.

Specification forming part of Letters Patent No- 1 77,164, dated May,9,1876 application filed April 13, 1876.

To all whom it may concern Be it known that I, FRANK SEWARD, of NewHaven, in the county of New Haven, and State of Connecticut,have'invented a-new Improvement in Drop-Lifters; and I do hereby declarethe following, when taken in connection withtheaccompanyingdrawings andthele'tters of reference marked thereon, to be a full, clear, and exactdescription, and which said drawings constitute part of thisspecification, and represent, in

. Figure 1, a plan or top view; Fig. 2, a side view; Fig. 3, alongitudinal central section; and in Fig. 4, a transverse section online Thisinvention relates to an improvement in apparatus for raisingdrop-hammers, commonly called drop-lifters.

In this apparatus the connection between the lifting mechanism and thehammer, to raise the hammer, is made instantaneous, and

ism.

The object of this invention is to relieve this sudden strain, andthereby prevent the concussion which usually occurs; and the inventionconsists in the arrangement of an elastic and the lift, as more fullyhereinafter de scribed.

The apparatus here shown is that known as the Peck lifter.

A is the bed; B;thedriving-shaft, supported in hearings B, and connectedto the lifter-shaft 0 through gears 0 0 To the shaft 0 thelifter crank Dis rigidly attached, and with suitable tripping mechanism E,substantially as in the usual construction. The gear (3 is loose uponthe shaft C, and in connection with this gear, or made as part of it,are two arms, F F, and attached to the ratchet or lifting device H, andalso loose upon the shaft 0, are two corresponding arms, G G. The endsof these arms are turned so that the arms F come'in rear of thecorresponding ends of the arms G, asseen in Figs. 1,2, and 4; hence thedriven gear 0 will communicate its motion to the ratchet H through thearms F F bearing against or coming ip contact with the correspondingarms G. Between the meeting surfaces of these arms an elastic material,a, is applied, and preferably a bolt, b, to connect the two arms, asseen in Fig. 4. The gear 0 and the ratchet or lifter H revolvecontinuously. The crank which lifts the hammer is held at its upposition by the tripping device E, 111 the usualmanner, the gear andratchet H revolvingindependently of the shaft while in that condition. tWhen the trip is removed 7 the hammer falls, and instantly on itsdescent the ratchet H engages with the pawl attached to a lever, I, fastto the shaft, and that engagement raises the hammer in the usual manner.

As the engagement of the ratchet H with the shaft'must thusbe vrysudden, it follows that great strain wilh produced upon the mechanism inthus instantly raising the hammer.

By the interposition of the elastic material a between the arms F andGr, that material yields upon the first concussion, and thus preventsthe extreme shock which would otherwise occur. Therefore, by separatingthe lifting ratchet H from the driving-gear, and interposing thiselastic material, the liability to the breakage of the machinery by thesudden concussion in raising the hammer is avoided.

The elastic material is best made of rubber; but it may be a metallicspring.

I claim- In a drop-lifter the elastic materialor spring arranged betweenthe driving-gear and the lifting mechanism, substantially as described.

FRANK SEWARD. Witnesses: V a

J. H. SHUMWAY, CLARA BROUGHTON.

